[R] Non-linear minimization

[Sébastien Ballesteros]

hello, I have got some trouble with R functions nlm(),
nls() or optim() : I would like to fit 3 parameters
which must stay in a precise interval. For exemple
with nlm() :

fn<-function(p) sum((dN-estdata(p[1],p[2],p[3]))^2)
out<-nlm(fn, p=c(4, 17, 5),
hessian=TRUE,print.level=2)

with estdata() a function which returns value to fit
with dN (observed data vactor)

My problem is that only optim() allows me to set
parameters interval with "L-BFGS-B" method but this
one doesn't work in my case.

I have heard about nls2 package (www.inra.fr/bia) but
it doesn't work on Windows.

Do you know any solutions

Thank's a lot for reading my post

Best regards

Sebastien
INA P-G ecology dpt